50 lines
1.1 KiB
Python
50 lines
1.1 KiB
Python
import sys
|
|
|
|
I = sys.stdin.read().splitlines()
|
|
G = [list(l) for l in I]
|
|
R = len(G)
|
|
C = len(G[0])
|
|
|
|
def rotate(G, F):
|
|
for r in range(R):
|
|
for c in range(C):
|
|
F[c][R-1-r] = G[r][c]
|
|
|
|
def tilt(G):
|
|
for x in range(C):
|
|
for y in range(R):
|
|
if G[y][x] == "O":
|
|
for j in range(y-1,0-1,-1):
|
|
if G[j][x] == '.':
|
|
G[j][x] = "O"
|
|
G[j+1][x] = "."
|
|
else:
|
|
break
|
|
|
|
score = lambda: sum((R-y)*row.count('O') for y,row in enumerate(G))
|
|
|
|
cache = {}
|
|
F = [['?' for _ in range(C)] for _ in range(R)] # pre-allocate saves 10% time (no GC)
|
|
|
|
target = 1_000_000_000
|
|
t = 0
|
|
while t<target:
|
|
print(t, end='\r')
|
|
t += 1
|
|
for j in range(4):
|
|
tilt(G)
|
|
if t==1 and j==0: # part 1
|
|
print(score())
|
|
rotate(G, F); F, G = G, F
|
|
#Gh = tuple(tuple(row) for row in G)
|
|
Gh = ''.join(''.join(row) for row in G)
|
|
if Gh in cache:
|
|
cycle_length = t-cache[Gh]
|
|
print(f'{t=}, {cycle_length=}')
|
|
amt = (target-t)//cycle_length
|
|
t += amt * cycle_length
|
|
cache[Gh] = t
|
|
|
|
print(t, score())
|
|
|